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Plasma rotation and momentum transport, and their relations to transport barriers

Sakamoto, Yoshiteru

The studies of plasma rotation and momentum transport are the most-watched core- transport topics over the last few years. It is well known that plasma rotation can play an important role to achieve high confinement and high beta. The large rotational shear can produce an internal transport barrier (ITB) by suppression of turbulence, and the enough rotation speed can suppress resistive wall modes. Although fast toroidal rotation and its large shear can be obtained in present devises thanks to large toroidal momentum input from neutral beams, slow plasma rotation is foreseen in burning plasmas under the conditions of low momentum input and dominant alpha heating. Therefore it is important to accurately predict plasma rotation profile in ITER and DEMO reactor. In this paper, recent progresses in the studies of plasma rotation and momentum transport are reviewed especially in spontaneous or intrinsic toroidal rotation, momentum pinch, and their relations to transport barriers.

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